Placentation Flashcards
Placental Types - Chorionic Villi:
Chorionic villi uniformly distributed across entire surface of chorion
Diffuse
Placental Types - Chorionic Villi:
Formation of specific zone of chorionic villi
Zonary
Placental Types - Chorionic Villi:
Discrete, disc-like zone
Discoid (common in primates)
Placental Types - Chorionic Villi:
“Button-like” structure
Cotyledonary
The Sow and the Mare are examples of what type of placentation?
Diffuse
What species have epitheliochorial?
Sow, Mares, Ruminants
What “layer is not present” in Endotheliochorial?
Endometrial epithelium
What species have Endotheliochorial?
Dogs and Cats
What species have Hemochorial?
Primates and rodents
What is left in Hemochorial?
Chorionic epithelium
Chorionic interstitium
Chorionic capillaries
Name the layers that separate fetal and maternal blood:
Maternal endothelium
Maternal interstitium
Maternal epithelium
Fetal epithelium (trophoblasts)
Fetal interstitium
Fetal endothelium
Match the species with the placental type:
Zonary
Canines and Felines
Match the species with the placental type:
Cotyledonary
Ruminants
- Cattle, Sheep and Goats
Match the following with the placental type:
Single zone for placental exchange
Discoid
What placentation distribution corresponds to a species that Implants into the endometrium?
Discoid
What structure contains fluid that the fetus directly swallows and inhales in utero?
Amniotic cavity
Match the following with the placental type:
Chorionic villi are distributed evenly across the endometrium
Diffuse
Which species has an Epitheliochorial?
Mares
Which species has a Synepitheliochorial or Syndesmochorial?
Ruminant
Which species has Endotheliochorial?
Felines and Canines
Which species has Hemochorial?
Primates and rodents
What materials can cross the placental barrier?
- Vitamins
- Glucose
- Small molecular weight hormones
- Some toxic materials
- Some microorganisms
- Some teratogenic materials
(T/F) Fetal stress initiates a cascade of events of parturition
True
What is the function of the following hormone?
ACTH
initiates parturition cascade of events
What is the function of the following hormone?
Estradiol
increased secretion of mucus
What is the function of the following hormone?
Oxytocin
secretion stimulated by increased pressure on cervix by fetus
What is the function of the following hormone?
Prostaglandin F2alpha
Promotes secretion of relaxin
Hormones from the placenta have which functions?
- Stimulate ovarian function
- Maintain pregnancy
- Stimulate fetal growth
- Stimulate mammary function
- Facilitate parturition
Maternal Hemorrhage and necrosis
pigmented zone
Microcotyledons
mare
Glycogen plaques
cotyledonary placenta
live birth
vivparous
egg laying
oviparous
Organ of fetal exchange of nutrients and metabolic wastes
Placenta
Blastocyst embeds in endometrium before placental development
implantation
mammals with a placenta
Eutherian
Semipermanent relationship between fetal extraembryonic membranes and maternal placenta
attachment
Can be detected in blood and urine at 8-10 days of gestation
hCG
Promotes fetal growth and stimulates mammary function
placental lactogen
PSBP
Binucleate giant cells
Helps stretch pelvic ligaments
relaxin
How many layers does the Endotheliochorial placenta have?
Five layers
How many layers does the Epitheliochorial placenta have?
Six layers
